I have an old 91 Toyota Camry with a V6 engine. It is a great running car except for a recent problem. I am finding that when I have the ac on, it runs very rough in idle. When I cut the ac off, it runs just fine. Is this because it is overcharged?? Any other possibility?
Thanks, Al Kondo
IAC (Idle Air Control) valve may be faulty.
Check the AC idle-up circuit - engine RPM should jump a little when the AC compressor is engaged. Also check the Idle Air Control valve to make sure it is not gummed up, although I would suspect that a gummed up IAC valve would cause rough idle whether or not the AC is engaged.
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